engine troubles
It does make the noise all the time, however when you first start it up and the choke comes on you can't hear it as much because the engine is much louder. It is most noticable at idle and taking off from a stop. It has been making this noise for quite a while now (at least 7500 miles I would guess). It was my grandfathers Winnebago, which he bought new in 1986 and he only used it a few times each summer on average. I think he used 10W-40 or 15W-40 oil. I have never tried Mystery oil but that is a good idea. I haven't changed the oil yet this year but in the past that hasn't seemed to cure it. Am I taking a risk driving this the way it is? It runs just fine other than the noise. Thanks for the help C Nash.